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Research progress of lithium polysulfide capture in lithium-sulfur batteries

  • HU Ting-Ting ,
  • LIU Hai-Jian ,
  • CHEN Yun-Yi ,
  • LIU Ling-Li ,
  • DAI Chun-Ai ,
  • HAN Yong-Sheng
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  • 1. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 2. School of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, China 3. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China 4. School of Energy Materials and Chemical Engineering, Hefei University, Hefei, Anhui 230601 China

Received date: 2022-11-08

  Revised date: 2023-01-14

  Online published: 2023-09-27

Abstract

Lithium-sulfur battery has an ultra-high theoretical specific capacity (1675 mAh/g) and theoretical specific energy (2600 Wh/kg), which is far higher than commercial secondary batteries. In addition, the sulfur element is rich in the earth, and its price is cheap, the extraction process is environmentally friendly. Therefore, a lithium-sulfur battery is considered as an ideal energy storage unit for the future energy storage system. However, the lithium polysulfide intermediates generated in the charging and discharging process are easily soluble in the electrolyte, resulting in a loss of active materials and an increase in the electrolyte viscosity. In addition, the dissolved lithium polysulfide is inclined to migrate between positive and negative electrodes, and reacts with the lithium negative electrode, causing irreversible loss of active substance sulfur, greatly reducing the battery life and safety. This phenomenon is called the shuttle effect, which hinders the commercialization process of lithium-sulfur batteries. In recent years, researchers have attempted to solve this problem through physical adsorption, chemical action, and external field constraint, and achieved impressive progress. This work summarizes the research progress of capturing lithium polysulfide, and compares the characteristics of each approach and its impact on the electrochemical performance of lithium-sulfur batteries. Whether it is the physical constraint of the porous structure of carbon materials, the chemical interaction between the carrier materials and lithium polysulfide, or the adsorption of electric and magnetic fields on lithium polysulfide, lithium polysulfide is fixed on the positive side and to inhibit its dissolution and diffusion to the negative electrode. Capturing lithium polysulfide by external magnetic field, internal magnetic field induced by magnetic particles, and internal electric field generated by spontaneous polarization of ferroelectric materials is also highlighted. Finally, the challenges in capturing lithium polysulfide and the possible solution are prospected.

Cite this article

HU Ting-Ting , LIU Hai-Jian , CHEN Yun-Yi , LIU Ling-Li , DAI Chun-Ai , HAN Yong-Sheng . Research progress of lithium polysulfide capture in lithium-sulfur batteries[J]. The Chinese Journal of Process Engineering, 2023 , 23(9) : 1231 -1243 . DOI: 10.12034/j.issn.1009-606X.222413

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